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S1D10605 Series
3 When the V/F circuit alone is used
V
DD
V
SS
External
power
supply
V
DD
C
2
C
2
C
2
C
2
C
2
5 When the built-in power circuit is used to drive a
liquid crystal panel heavily loaded with AC or DC, it
is recommended to connect an external resistor to
stabilize potentials of V
output from the built-in voltage follower.
R
4
C
2
R
R
4
* 1 Because the V
terminal input impedance is high, use short leads and shielded lines.
R
* 2 C
and C
are determined by the size of the LCD being driven. Select a value that will stabilize the liquid crystal
1
2
drive voltage.
* 3 When using external power supply, large current flows during RES = LOW. Please be careful.
Example of the Process by which to Determine the Settings:
• Turn the voltage regulator circuit and voltage follower circuit ON and supply a voltage to V
• Determine C
by displaying an LCD pattern with a heavy load (such as horizontal stripes) and selecting a C
2
stabilizes the liquid crystal drive voltages (V
value.
• Next turn all the power supplies ON and determine C
34
IRS
M/S
V
SS2
V
OUT
CAP3–
CAP1+
CAP1–
CAP2+
CAP2–
V
5
V
R
V
DD
V
1
V
2
V
3
V
4
V
5
, V
, V
and V
which are
1
2
3
4
V
, V
DD
0
R
4
V
1
V
2
V
3
V
4
4
It is recommended to set an optimum
resistance value R
display and the drive waveform.
V
5
1
4 When the built-in power is not used
V
DD
External
power
supply
Examples of shared reference settings
When V
Item
Reference set value R
: 100kΩ to 1MΩ
4
taking the liquid crystal
4
Figure 17
to V
). Note that all C
capacitors must have the same capacitance
5
2
.
1
EPSON
V
SS
IRS
M/S
V
SS2
V
OUT
CAP3–
CAP1+
CAP1–
CAP2+
CAP2–
V
5
V
R
V
DD
V
1
V
2
V
3
V
4
V
5
can vary between –8 and 12 V
5
Set value
C
1.0 to 4.7
1
C
0.01 to 1.0
2
OUT
V
DD
Units
µF
µF
from the outside.
that
2
Rev.2.1
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